| 摘要 |
A disk brake having a cylinder apparatus wherein although an opening of a cylinder body is closed by a covering member, processing and parts' costs are reduced, fluid leakage is prevented, and the apparatus can be reduced in size. A piston (17) is caused to slidingly move in a bore (26) of a cylinder (21) of the cylinder apparatus. The cylinder (21) includes a covering member (43) provided in a bottom portion (42) of the cylinder (21), and a cylinder body (46) having an opening that is closed by the covering member (43). The covering member (43) is friction stir welded to the cylinder body (46). |
